CN114029455A - Investment casting single sprue with slag collecting groove - Google Patents
Investment casting single sprue with slag collecting groove Download PDFInfo
- Publication number
- CN114029455A CN114029455A CN202111275354.3A CN202111275354A CN114029455A CN 114029455 A CN114029455 A CN 114029455A CN 202111275354 A CN202111275354 A CN 202111275354A CN 114029455 A CN114029455 A CN 114029455A
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- China
- Prior art keywords
- collecting groove
- slag
- slag collecting
- sprue
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002893 slag Substances 0.000 title claims abstract description 96
- 238000005495 investment casting Methods 0.000 title claims abstract description 27
- 238000005266 casting Methods 0.000 claims abstract description 37
- 239000003818 cinder Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009416 shuttering Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses an investment casting single sprue with a slag collecting groove, which is characterized in that: comprises a pouring cup (1), the pouring cup (1) is connected with a direct flow channel (2), and a slag collecting groove (3) is arranged below the direct flow channel (2). Because the slag collecting groove is small in size and large in heat dissipation area and is rapidly solidified, molten metal at the front end of a liquid flow with molten slag is blocked in the slag collecting groove, the molten metal which is relatively pure after being subjected to slag removal continuously rises to enter a casting cavity through an ingate and is solidified to obtain a casting, and the influence of the slag inclusion defect of the casting is reduced. The slag collecting groove is annular, the outer edge of the slag collecting groove is provided with an upward bulge, the width of the annular slag collecting groove is 30-40mm, and the metal liquid can be effectively blocked. After X-ray inspection, the scrap rate of the slag inclusion defects of the castings produced by the single-sprue pouring process with the slag collecting groove is reduced by 65 percent compared with that of the castings produced by the traditional single-sprue pouring process.
Description
Technical Field
The invention belongs to the technical field of novel investment casting single straight pouring channels, and particularly relates to an investment casting single straight pouring channel with a slag collecting groove.
Background
At present, when castings of alloy steel, stainless steel and the like with higher requirements on internal quality are subjected to investment casting, the castings with complete external dimension, excellent internal structure and good mechanical properties are mainly obtained. The usual investment casting sprue form is: a straight-through single sprue of circular, rectangular, triangular or polygonal cross-section, with the ingate of the casting welded to two (or more) sides of the sprue. When pouring, the molten metal is poured into the sprue from the pouring cup, the residual slag in the molten metal rises along with the liquid level, when the liquid level rises to the inner pouring gate, a part of slag enters a casting cavity from the inner pouring gate along with the molten metal, and slag inclusion defects are formed in the casting after the casting is solidified.
Therefore, when the investment casting process method for directly assembling and welding the castings on the traditional single sprue is adopted to produce castings such as alloy steel, stainless steel and the like, slag inclusion defects are difficult to avoid, and the scrappage ratio due to the slag inclusion defects is counted to be about 60%.
In summary, alloy steel, stainless steel and superalloy castings produced by the conventional single sprue casting process have two disadvantages: firstly, the internal quality cannot be guaranteed, and the rejection rate is high; secondly, the construction period is difficult to guarantee. Therefore, a single-sprue process method with a slag collecting function is needed to be designed to reduce the rejection rate of slag inclusion defects of investment castings.
The applicant filed the chinese patent CN106424575A, a gating system with a slag collecting trough, which has a complicated structure, and the structure of the slag collecting trough is not suitable for a single sprue, so it is necessary to design a new type of investment casting single sprue with a slag collecting trough.
Disclosure of Invention
The invention aims to provide an investment casting single sprue with a slag collecting groove. Avoiding slag inclusion defect and producing high-quality castings made of alloy steel, stainless steel and other materials.
The technical scheme of the invention is as follows: an investment casting single sprue with a slag collecting groove comprises a sprue cup, wherein the sprue cup is connected with a straight runner, and the slag collecting groove is arranged below the straight runner.
The investment casting single straight pouring channel with the slag collecting groove is characterized in that the straight flow channel is connected with the inner pouring channel and the casting.
According to the investment casting single sprue with the slag collecting groove, the slag collecting groove is arranged on the side face of the sprue, which is within the range of 20-40mm away from the bottom end.
In the investment casting single sprue with the slag collecting groove, the cross section of the straight runner is circular, triangular, quadrilateral or polygonal, and the slag collecting groove is annular or independent sheet-shaped and surrounds the side wall of the straight runner.
The single sprue is cast by the investment mold with the slag collecting groove, and the cross section of the slag collecting groove is of a flat plate structure.
According to the investment casting single sprue with the slag collecting groove, the outer edge of the section of the slag collecting groove is provided with an upward bulge.
The invention has the beneficial effects that: the invention pours the molten metal into the casting shell group qualified by roasting from the sprue, along with the continuous injection of the molten metal, the molten metal continuously rises in the sprue, the molten metal at the front end containing more slag enters the slag collecting groove when rising to the feed inlet of the slag collecting groove, and the molten metal at the front end of the liquid flow with the slag is blocked in the slag collecting groove because the slag collecting groove has small size and large heat dissipation area and is rapidly solidified, and the purer molten metal after deslagging continuously rises to enter the casting cavity through the inner sprue and is solidified to obtain the casting, thereby reducing the influence of the slag inclusion defect of the casting. The slag collecting groove is annular, the outer edge of the slag collecting groove is provided with an upward bulge, the width of the annular slag collecting groove is 30-40mm, and the metal liquid can be effectively blocked. After X-ray inspection, the scrap rate of the slag inclusion defects of the castings produced by the single-sprue pouring process with the slag collecting groove is reduced by 65 percent compared with that of the castings produced by the traditional single-sprue pouring process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a structural view of a conventional single sprue;
FIG. 3 is a schematic view of a gating system for connecting the bracket castings;
FIG. 4 is a schematic structural view of a pouring system of a casting with a slag collection groove of a mounting seat shell.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example 1 of the invention: an investment casting single sprue with a slag collecting groove comprises a sprue cup 1, wherein the sprue cup 1 is connected with a straight runner 2, and a slag collecting groove 3 is arranged below the straight runner 2.
The sprue 2 connects the ingate 4 and the casting 5.
The side surface of the straight runner 2 within the range of 20-40mm from the bottom end is provided with a slag collecting groove 3.
The cross section of the straight runner 2 is circular, triangular, quadrangular or polygonal, and the slag collecting groove 3 is annular or independent sheet-shaped and surrounds the side wall of the straight runner 2. The slag collection groove 3 may be changed according to the shape of the straight flow passage 2, or may be designed to be entirely surrounded, or may be provided only on the side having a large amount of slag.
The section of the slag collecting groove 3 is of a flat plate structure.
The outer edge of the cross section of the slag collecting groove 3 is provided with an upward bulge, so that the blocking effect is better.
The annular width of the slag collecting groove 3 is 30-40 mm.
The preparation method comprises the following steps:
manufacturing a metal mold of a straight runner according to the structure;
manufacturing a wax mold of the sprue by using a metal mold of the single sprue;
manufacturing a casting wax mold, and welding the casting wax mold to the single sprue wax mold to form a wax mold set;
fourthly, cleaning a wax die set;
the manufacturing of the formwork comprises the steps of preparing the coating, manufacturing the surface layer formwork, manufacturing the transition layer formwork and manufacturing the back layer model shell:
preparation of the coating: preparing a shell-making coating according to the ingredient proportion shown in the table 1;
TABLE 1 coating formulation Process
Preparing a surface layer shell: immersing the wax die set into the surface layer coating, not stopping rotating, uniformly coating the wax die set with the coating, taking out, spraying zircon sand, and drying for 5-6 h;
preparing a transition layer shell: and dip-coating the transition layer coating by the same method as the surface layer shell, scattering mullite sand, and drying for 8-10 h. Then, coating, sanding and drying are carried out, and the steps are repeated twice, so that a transition layer shell is prepared;
preparing a back layer shell: and dip-coating the back layer coating by the same method as the surface layer shell, scattering mullite sand, and drying for 12-15 h. Then, coating, sanding and drying are carried out for three times, and the transition layer shell is prepared;
sealing the slurry: sealing the slurry by using a back coating and drying for 16-24 h.
Sixthly, putting the module with the finished shell into a dewaxing kettle for dewaxing, and obtaining a mould shell after dewaxing is finished;
placing the shuttering in a shuttering roaster to roast at the temperature of 1000-1100 ℃;
and casting the molten metal into the roasted mould shell to be solidified to obtain the casting.
When the casting mold is used, molten metal is poured into a casting mold shell group qualified in roasting from the direct current channel 2, the molten metal continuously rises in the direct current channel 2 along with the continuous injection of the molten metal, the molten metal at the front end containing more molten slag enters the slag collecting groove 3 when rising to the feed inlet of the slag collecting groove 3, the molten metal at the front end of the molten liquid flow with the molten slag is blocked in the slag collecting groove 3 due to the small size and large heat dissipation area of the slag collecting groove 3 and is rapidly solidified, and the relatively pure molten metal after deslagging continuously rises to enter the cavity of the casting 5 through the inner pouring gate 4 and is solidified to obtain the casting.
Example 2 of the invention: an investment casting single sprue with a slag collecting groove comprises a sprue cup 1, wherein the sprue cup 1 is connected with a straight runner 2, and a slag collecting groove 3 is arranged below the straight runner 2.
The sprue 2 connects the ingate 4 and the casting 5.
And a slag collecting groove 3 is arranged on the side surface of the straight flow channel 2 which is 30mm away from the bottom end.
The slag collecting groove 3 is annular, and the outer edge of the slag collecting groove is provided with an upward bulge.
The annular width of the slag collecting groove 3 is 35 mm.
Example 3 of the invention: an investment casting single sprue with a slag collecting groove comprises a sprue cup 1, wherein the sprue cup 1 is connected with a straight runner 2, and a slag collecting groove 3 is arranged below the straight runner 2.
The sprue 2 connects the ingate 4 and the casting 5.
And a slag collecting groove 3 is arranged on the side surface of the straight flow channel 2, which is 25mm away from the bottom end.
The cross section of the straight flow channel 2 is quadrilateral, and the slag collecting groove 3 is in an independent sheet shape and is arranged on one side surface of the straight flow channel 2.
The section of the slag collecting groove 3 is of a flat plate structure. The annular width of the slag collecting groove 3 is 38 mm.
Example 4 of the invention: an investment casting single sprue with a slag collecting groove comprises a sprue cup 1, wherein the sprue cup 1 is connected with a straight runner 2, and a slag collecting groove 3 is arranged below the straight runner 2.
And a slag collecting groove 3 is arranged on the side surface of the straight runner 2 which is 35mm away from the bottom end.
The cross section of the straight runner 2 is trilateral, and the slag collecting groove 3 is independent sheet-shaped and is arranged on 2 side faces of the straight runner 2.
The section of the slag collecting groove 3 is of a flat plate structure. The annular width of the slag collecting groove 3 is 32 mm.
Claims (7)
1. The utility model provides an investment casting single sprue with collection cinder notch which characterized in that: comprises a pouring cup (1), the pouring cup (1) is connected with a direct flow channel (2), and a slag collecting groove (3) is arranged below the direct flow channel (2).
2. The investment casting single sprue having a slag trap according to claim 1 wherein: the straight runner (2) is connected with the ingate (4) and the casting (5).
3. The investment casting single sprue having a slag trap according to claim 1 wherein: and a slag collecting groove (3) is arranged on the side surface of the straight flow channel (2) within the range of 20-40mm from the bottom end.
4. The investment casting single sprue having a slag trap according to claim 1 wherein: the cross section of the straight runner (2) is circular, triangular, quadrilateral or polygonal, and the slag collecting groove (3) is annular or independent sheet-shaped and surrounds the side wall of the straight runner (2).
5. The investment casting single sprue having a slag trap according to claim 1 wherein: the section of the slag collecting groove (3) is of a flat plate structure.
6. The investment casting single sprue having a slag trap according to claim 1 wherein: the outer edge of the section of the slag collecting groove (3) is provided with an upward bulge.
7. The investment casting single sprue having a slag trap according to claim 1 wherein: the width of the ring shape of the slag collecting groove (3) is 30-40 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275354.3A CN114029455B (en) | 2021-10-29 | 2021-10-29 | Investment casting single sprue with slag collecting groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275354.3A CN114029455B (en) | 2021-10-29 | 2021-10-29 | Investment casting single sprue with slag collecting groove |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114029455A true CN114029455A (en) | 2022-02-11 |
| CN114029455B CN114029455B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111275354.3A Active CN114029455B (en) | 2021-10-29 | 2021-10-29 | Investment casting single sprue with slag collecting groove |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535558A (en) * | 2022-03-09 | 2022-05-27 | 河南省西交轻质合金新材料研究院有限公司 | Control device and method for liquid flow during magnesium alloy semi-continuous casting starting |
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| CN209349465U (en) * | 2018-12-27 | 2019-09-06 | 大连船用推进器有限公司 | Marine distance adjusting propeller hub body casting device |
| CN110732640A (en) * | 2019-10-24 | 2020-01-31 | 中船海洋动力部件有限公司 | Casting system for flywheel of marine diesel engine |
| CN212264448U (en) * | 2020-04-15 | 2021-01-01 | 宁夏苏宁新能源设备有限公司 | Middle groove ledge lost foam casting mold |
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2021
- 2021-10-29 CN CN202111275354.3A patent/CN114029455B/en active Active
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|---|---|---|---|---|
| CN202571176U (en) * | 2012-04-18 | 2012-12-05 | 中国南方航空工业(集团)有限公司 | Casting head |
| CN204171285U (en) * | 2014-10-27 | 2015-02-25 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of aero-engine aluminum alloy baffle plate metal type cast system |
| CN204953824U (en) * | 2015-05-29 | 2016-01-13 | 安徽丰瑞金属制品有限公司 | A mould for casing casting parts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535558A (en) * | 2022-03-09 | 2022-05-27 | 河南省西交轻质合金新材料研究院有限公司 | Control device and method for liquid flow during magnesium alloy semi-continuous casting starting |
| CN114535558B (en) * | 2022-03-09 | 2024-06-07 | 河南省西交轻质合金新材料研究院有限公司 | Control device and method for liquid flow during starting of magnesium alloy semi-continuous casting |
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| Publication number | Publication date |
|---|---|
| CN114029455B (en) | 2024-03-01 |
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